How Exact

USB interface is now the most common interface for connecting peripheral devices to a computer.You can connect via USB printers, scanners, mice, keyboards, external hard drives ... In place of the usual USB 2.0 interface will soon be a new, improved interface USB 3.0.

Abbreviation USB denotes "Universal Serial Bus." This interface is used to connect a low-speed and medium speed peripherals.In 1996, the specification was released USB 1.0. She supported data transfer rates up to 12 Mbit / s.Hi-Speed ​​interface USB 2.0 , introduced in 2000, supports data transfer up to 480 Mbit / s.Now this interface the most common and is used in most of the peripheral devices.But it will soon be replaced by a new high-speed interface USB 3.0.

Final USB 3.0 specification was introduced in 2008, but it has not yet entered into mass use.What are the main features of interface USB 3.0 ?What can we expect from him?

need to implement USB 3.0 interface due to the fact that many modern devices, a higher data rate.Besid

es, they have enough power, which can provide a USB 2.0.USB 3.0 is more support high data rate - up to 4.8 Gbit / s. This is achieved including through additional lines.Standard USB 2.0 cable comprises four lines - twisted pair for data transmission and reception, and also two power supply lines (plus and zero).USB 3.0 cable thicker because it was added in two twisted pairs (i.e., four new link).However, USB 3.0 cable will be shorter (maximum length - 3 meters compared to 5 meters for USB 2.0).From the use of optical fiber in the USB 3.0 have decided to give up, because it is very expensive for mass use.

controllers and connectors are USB 3.0 compatible with USB 2.0, both physically and functionally. plug USB 3.0 contains contacts USB 2.0, and the depth of the connector but there was one more pin number with five pins.Cable Connector allows a glance to determine the version of the standard USB.However, this arrangement of contacts means that USB 3.0 plug must be inserted into the appropriate port "until it stops."If you insert the plug into the port is completely optional pin number will not be used, so the data rate is conform to the interface USB 2.0.

little more about compatibility with USB 2.0 and USB 3.0. devices with USB 2.0 connection type A (for example, a flash card) can be connected to a USB 3.0 port, and vice versa, but in this case the speed of data transmission and reception will correspond to the interface USB 2.0.A device with a USB 2.0 connector type B (such as a printer) is connected to the port USB 3.0, but on the contrary it will be impossible to do.Also, USB 3.0 cable will not work if it is connected to the controller USB 1.1.

also has USB 3.0 increased amperage (900mA compared to 500mA in USB 2.0).This would eliminate the additional power supply and USB-connectors in many devices.Especially important is the current for portable hard drives.It will also enable faster charging mobile devices from USB.

introduction of USB 3.0 interface will inevitably lead to the emergence of new USB-hubs (hubs) with support for USB 3.0 , which allow you to connect multiple devices to a single USB-controller.Concentrators to support USB 3.0 interface will be more difficult as they have to simultaneously support and USB 2.0.Therefore, it is likely that the first generation of these hubs will not cheap.

However, the USB 3.0 interface is still not supported by all operating systems and motherboards. Some manufacturers have released motherboards on the market with support for USB 3.0, but some firms are not in a hurry to implement support for USB 3.0 in its chipsets, considering that this standard does not immediately become widespread.

new kernel Linux , according to developers, has interface support USB 3.0.But Windows 7 until it can not boast: the final USB 3.0 specification was announced shortly before the release of the operating system, so developers do not have time to implement support for the new interface.However, it is possible that support USB 3.0 will be available by installing OS updates.It is not known whether implementing support for USB 3.0 and SuperSpeed ​​technology for Windows XP and Windows Vista.